1 /* $NetBSD: uudecode.c,v 1.8 1997/10/20 02:46:37 lukem Exp $ */ 2 3 /*- 4 * Copyright (c) 1983, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #ifndef lint 38 __COPYRIGHT("@(#) Copyright (c) 1983, 1993\n\ 39 The Regents of the University of California. All rights reserved.\n"); 40 #endif 41 42 #ifndef lint 43 #if 0 44 static char sccsid[] = "@(#)uudecode.c 8.2 (Berkeley) 4/2/94"; 45 #endif 46 __RCSID("$NetBSD: uudecode.c,v 1.8 1997/10/20 02:46:37 lukem Exp $"); 47 #endif /* not lint */ 48 49 /* 50 * uudecode [file ...] 51 * 52 * create the specified file, decoding as you go. 53 * used with uuencode. 54 */ 55 #include <sys/param.h> 56 #include <sys/stat.h> 57 #include <err.h> 58 #include <errno.h> 59 #include <locale.h> 60 #include <pwd.h> 61 #include <stdio.h> 62 #include <string.h> 63 #include <unistd.h> 64 65 static int decode __P((void)); 66 static void usage __P((void)); 67 int main __P((int, char **)); 68 69 char *filename; 70 71 int 72 main(argc, argv) 73 int argc; 74 char *argv[]; 75 { 76 int rval; 77 78 setlocale(LC_ALL, ""); 79 80 while (getopt(argc, argv, "") != -1) 81 usage(); 82 argc -= optind; 83 argv += optind; 84 85 if (*argv) { 86 rval = 0; 87 do { 88 if (!freopen(filename = *argv, "r", stdin)) { 89 warnx("%s", *argv); 90 rval = 1; 91 continue; 92 } 93 rval |= decode(); 94 } while (*++argv); 95 } else { 96 filename = "stdin"; 97 rval = decode(); 98 } 99 exit(rval); 100 } 101 102 static int 103 decode() 104 { 105 extern int errno; 106 struct passwd *pw; 107 int n; 108 char ch, *p; 109 int mode, n1; 110 char buf[MAXPATHLEN]; 111 112 /* search for header line */ 113 do { 114 if (!fgets(buf, sizeof(buf), stdin)) { 115 warnx("%s: no \"begin\" line", filename); 116 return(1); 117 } 118 } while (strncmp(buf, "begin ", 6)); 119 (void)sscanf(buf, "begin %o %s", &mode, buf); 120 121 /* handle ~user/file format */ 122 if (buf[0] == '~') { 123 if (!(p = strchr(buf, '/'))) { 124 warnx("%s: illegal ~user.", filename); 125 return(1); 126 } 127 *p++ = '\0'; 128 if (!(pw = getpwnam(buf + 1))) { 129 warnx("%s: no user %s.", filename, buf); 130 return(1); 131 } 132 n = strlen(pw->pw_dir); 133 n1 = strlen(p); 134 if (n + n1 + 2 > MAXPATHLEN) { 135 warnx("%s: path too long.", filename); 136 return(1); 137 } 138 memmove(buf + n + 1, p, n1 + 1); 139 memmove(buf, pw->pw_dir, n); 140 buf[n] = '/'; 141 } 142 143 /* create output file, set mode */ 144 if (!freopen(buf, "w", stdout) || 145 fchmod(fileno(stdout), mode&0666)) { 146 warnx("%s: %s", buf, filename); 147 return(1); 148 } 149 150 /* for each input line */ 151 for (;;) { 152 if (!fgets(p = buf, sizeof(buf), stdin)) { 153 warnx("%s: short file.", filename); 154 return(1); 155 } 156 #define DEC(c) (((c) - ' ') & 077) /* single character decode */ 157 /* 158 * `n' is used to avoid writing out all the characters 159 * at the end of the file. 160 */ 161 if ((n = DEC(*p)) <= 0) 162 break; 163 for (++p; n > 0; p += 4, n -= 3) 164 if (n >= 3) { 165 ch = DEC(p[0]) << 2 | DEC(p[1]) >> 4; 166 putchar(ch); 167 ch = DEC(p[1]) << 4 | DEC(p[2]) >> 2; 168 putchar(ch); 169 ch = DEC(p[2]) << 6 | DEC(p[3]); 170 putchar(ch); 171 } 172 else { 173 if (n >= 1) { 174 ch = DEC(p[0]) << 2 | DEC(p[1]) >> 4; 175 putchar(ch); 176 } 177 if (n >= 2) { 178 ch = DEC(p[1]) << 4 | DEC(p[2]) >> 2; 179 putchar(ch); 180 } 181 if (n >= 3) { 182 ch = DEC(p[2]) << 6 | DEC(p[3]); 183 putchar(ch); 184 } 185 } 186 } 187 if (!fgets(buf, sizeof(buf), stdin) || strcmp(buf, "end\n")) { 188 warnx("%s: no \"end\" line.", filename); 189 return(1); 190 } 191 return(0); 192 } 193 194 static void 195 usage() 196 { 197 (void)fprintf(stderr, "usage: uudecode [file ...]\n"); 198 exit(1); 199 } 200